The monastery was founded by anchorite monks in the 18th-century. Shortly after its completion, it suffered damage from the Great Lisbon earthquake. This earthquake followed up by a Tsunami almost totally destroyed Lisbon. They estimate it had a death toll between 30,000 and 50,000 people. Making it one of the deadliest earthquakes in world history. Luckily the monastery got restored and remained open for worship until the 20th-century.
In the eighties, it got abandoned. Nowadays it's easy to overlook, hidden underneath the green wilderness. From the ground up towards the roofs, it's covered by vegetation. Resulting in many dark corridors and inaccessible overgrown rooms.